Don't suppose the preferred remedy is safe in the Metropolis, there's too many bunny-huggers!
Next suggestion is to learn the distinctive "clack-clack" distress note, and imitate . This is the sound they make when threatened by cats etc, and a practised rendering distracts them and they move away. There is no permitted trap or poison sanctioned for amateur use. Its one more alien species that have established a cushy living in our forests,parks and gardens to the detriment of our native Red squirrel, which is only found in a few more remote locations:Breckland Norfolk, Isle of Wight, Brownsea Island in Poole harbour .